Amethyst (Agate/Chalcedony variety)

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Vibrant purple/magenta (likely dyed); Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.65

Formation & Geological History

Formed from silica-rich groundwater depositing in cavities or geodes of volcanic or sedimentary rocks. This specific specimen appears to be a cabochon of translucent chalcedony or agate that has been artificially dyed to achieve its intense purple hue.

Uses & Applications

Primarily used for jewelry, lapidary art, and fashion accessories such as brooches and pendants.

Geological Facts

Natural amethyst is rarely this uniformly saturated and translucent in cabochon form; most stones with this specific neon-like 'grape' color are white or gray chalcedony that has been boiled in mineral salts and heat-treated.

Field Identification & Locations

Identify by its translucent nature, the lack of visible crystal faces, and the curved, glass-like reflection on its surface. It won't be scratched by a steel knife. Commonly found as part of large-scale manufacturing in Brazil and Uruguay.

Identified on: 4/29/2026

Mode: Standard